English

Definition of frightfully adverb from the Oxford Advanced Learner's Dictionary

 

frightfully

 adverb
adverb
BrE BrE//ˈfraɪtfəli//
 
; NAmE NAmE//ˈfraɪtfəli//
 
(old-fashioned, especially British English)
 
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very; extremely synonym awfully, frightfully I'm frightfully sorry.
See the Oxford Advanced American Dictionary entry: frightfully